Pretty sure they wanted to put the stations on the sides of the bridge from Day 1 but it was Gene who said no.
It was either Gene or Bob Justman.
The problem with the extra bridge stations is that you need people to man them. That means hiring non-speaking extras to stand around and look busy during shots. That costs the production money. So the bridge side stations were nixed as a money-saving move.
That's why I think it was a Bob Justman move.